(figuratively) A specific way of thinking about a particular topic, concept, or problem. / (figuratively) Way of thinking.

plural of line officer

(US) A commissioned officer who exercises general command authority and is eligible for operational command positions.

(rail transport) A main railway line which usually forms the backbone of a rail network. / The main line of a canal, from which other sections diverge.

simple past tense and past participle of side-line

present participle of side-line

present participle of side line

Alternative form of sideline

Alternative form of sideline

simple past tense and past participle of side line